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PHP按最大宽高等比例缩放图片类
本来用phpthumb来缩略图片是十分方便的,但是最近在sae上写项目发现phpthumb在sae上保存文件时会出问题,想来实现一个简单的按最大宽高等比例缩放图片类也并不困难,于是便自己写了一个方便修改。 需GD库支持,可支持jpg、jpeg、png、gif格式的图片,代码短小适合新手学习用。 [php]<?php class slpic { //原图片文件,包含路径和文件名 var $orpic; //原图的临时图像 var $tempic; //缩略图 var $thpic; //原宽度 var $width; //原高度 var $height; //图片类型 var $type; //缩略后的宽度 var $thwidth; //缩略后的高度 var $thheight;
function __construct($file){
$this->orpic = $file;
$infos = getimagesize($file);
$this->width = $infos[0];
$this->height = $infos[1];
$this->type = $infos[2];
}
//根据用户所指定最大宽高来计算缩略图尺寸
function cal_size($maxwidth, $maxheight){
//缩略图最大宽度与最大高度比
$thcrown = $maxwidth/$maxheight;
//原图宽高比
$crown = $this->width/$this->height;
if($crown/$thcrown >= 1){
$this->thwidth = $maxwidth;
$this->thheight = $maxwidth/$crown;
} else {
$this->thheight = $maxheight;
$this->thwidth = $maxheight*$crown;
}
}
function init(){
switch($this->type){
case 1: //GIF
$this->tempic = imagecreatefromgif($this->orpic);
break;
case 2: //JPG
$this->tempic = imagecreatefromjpeg($this->orpic);
break;
case 3: //PNG
$this->tempic = imagecreatefrompng($this->orpic);
break;
default:
echo '暂不支持该图片格式';
}
}
function resize($maxwidth, $maxheight){
//初始化图像
$this->init();
//计算出缩略图尺寸
$this->cal_size($maxwidth, $maxheight);
$this->thpic = imagecreatetruecolor($this->thwidth, $this->thheight);
imagecopyresampled($this->thpic, $this->tempic, 0, 0, 0 ,0, $this->thwidth, $this->thheight, $this->width, $this->height);
}
function save($filename, $type){
switch($type){
case 'jpg':
case 'jpeg':
imagejpeg($this->thpic, $filename);
break;
case 'png':
imagepng($$this->thpic, $filename);
break;
case 'gif':
imagegif($$this->thpic, $filename);
break;
default:
echo '暂不支持您所选择的格式';
}
}
} ?>[/php]
160 Words
2013-05-07 16:54 +0000
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